Internal-combustion engine.



. S. I. PHESCO-T.' INTERNAL COMBUSTION ENGINE.

APPLICATION FILED Home. Isls.

- /yrfwa I S. I.'PRESC`0TT.

mrEnNAL oo MBu'sTloN ENGINEV APrLlcmou man Nov.1s.191s. I v

Patented 'May 1, 1917.

3 SHEETS-SHEET 2 Patented May 1, 1917.

3 SHEETS-SHEET 3 SYDNEY I. PRESCOTT, OF NEW YORK, N. Y.

INTRNALCOMBUSTION ENGINE.

Specification of Letters Patent.

Pa. telit-ed May 1, 1917.

Application led November 16, 1915. Serial No. 61,73'

To all whom it may concern:

Be it known that l., SYDNEY l. PnEsooT'r, a citizen of the ,UnitedStates, residing at New. York, county of New York, and State of NewYork, ha re invented a new and useful Improvement in Internal-CombustionEngines, of which thc folloiving is a specification.

This invention relates to an iini'noveinent in internal combustionengines, particularly to those of the multi-cylinder two-cycle type" lntwo-cycle engines heretofore employed, it has been customary tointroduce a charge of fresh gas into the combustion chamber of thecylinder while the chamber was filled with fianiing gas passing outthrough the exhaust port, the greater speed of the exhaust being reliedupon to prevent ignition of the incoming charge. "The present inventionhas for one of its oliij'ects the production of a two-cycle engine inwhich. a scavenging charge of clean. air preferablyr under pressureintroduuredy into the coniliustioi'i chamber after the exl'iaust porthas opened` and before a charge of fresh flows into` the chamber. Thisis for twoY distinct purposes: first, to drive the buiined gas out olithe cylinder in decreased tiine the pressure within the cylinder falls;and second, to forni a cloud` or barrier of clean-air .lie-

tween the outgoing flaming gas and 'an in' coi'ning charge of fresh gasparticularly when, as in the iiiresent instance', the incorning chargeof fresh flows at high speed.

The speed of two-cycle engines heretofore employed haslocen liniitedbecause, aniong other reasons, of the liinited tiine availaliile forexhausting the burned' from the cylinder and introducii'ig a charge of.fresh gas. The present invention has for another of its objects theproduction of a two-cycle engine in which the initial pies -sure of thecharge` of fresh gas is greatly inrrcased over that heretofore foundpossiblev in this type of engine so that the transfer of tlgl fresh.from the induction. chamber to the combustion chamber is inade in niuchtime than has heretofore been possible. 'Duo partly to the quickerexpulsion of burned gas from the cylinder by the use of scavenging air'under pressure, and partly to `the quicker transfer' of the fresh gasfrom the induction chainber to the combustion chamber of the cylinder,which is iniide pos sible by the use of Alhe barrier of clean air yinthe cylinder betueen the outgoing fiaining gas and the inc( ining freshgas and byV the higher initial pi essure of the fresh gas charge, higherengini speed is attained.

In certain types oi two-cycle engines herci,

tofore used, fresh has been pumped into the crankcase, thereincompressed slightly, and than transferied to` the coinbustiiin chambersolely through ports or passage.4 uncontrolled by an)` valve mechanism..In certa-in other types the initial charge of fresh gas has been drawninto and coinpressed in the lower part of one cylinder, and thentransferied to the combustion chainber of anothei cylinder, thistransfer being' effected thioi gli the agency of suitable passages and adistributor' Valve. Thepi ,sont invention has for another of its objectsthe production of a two-cycle engine in' which. an induction :li amberis fori'ned within apiston, fresh g: `sbeing drawn' into thiscliai'nlier by 'the ino rcinentlof the piston in one direction,coinpiesscd tlierein du ig the movement' of the p ston in the oppositediieetioi'i, and then tr: nsferred through a snitalile port iirthc wallof the piston and short ily-pass passages to the con'ibustion chai'nberand the (.:ylinder in which the piston Works,

the time of the trai sfer being controlled by a rota ry valve.

Another object oil the invention is the production of a, twomy :leengine of the general cliiaraeter justdesc ibed, in which a single valvenot only cont cls the transfer of fresh gas from the indue' ion chamberto the coinbustion chamber, hi t also coi'itrols the intake of fresh gasto tin induction cliai'nber and further controls tht iiiitrloduction ofscavenging clean air into the combustion chamber just prior to thetransfer of a charge of fresh RS. l i,

lVith the..v and )ther objects not specifically incntioned in View, theinvention consists.- in certain 1arte, constructions and cornl'iinationswhicl will be hereinafter fully described and thei specifically setforth in the claims her-cunt( appended.

In the accoinp: nying drawings, which form a part of this specificationand in which like characters of reference indicate the saineor like pats, Figure 'l is a sectional elevation through one cylinder of amulticylinder engine constructed in accordance with the invention; Fig.2 is a plan View of 1" having a wall port and working within thecylinder, means cooperative with the piston to form an induction chamberwithin the piston, and means coperative with and controlling the pistonport to establish open communication between the induction chaml ber andthe source of gas supply, then confine the charge of gas within theinduction chamber 'substantially to the end of the power stroke, andthen elllect its transfer to the combustion chamber during the rst partof the return stroke. In the best'- constructions, there is alsoprovided 'a source of clean air supply and means for introducing cleanair into the combustion chamber of the cylinder after the exhaust porthas opened and the liaming gas has begun to n flow outward and before acharge of 4fresh gas begins to flow into the combustion chamber. In thebest constructions also, a rotary valve and cop'erative by-passmechanism is utilized for the purpose of controlling the inflow of gasto the induction chamber, the inflow' of clean air to the combus tionchamber for scavenging purposes, and the transfer of the fresh gas fromthe induction chamber to the combustion chamber. In the bcstconstructionalso, the induction chamber is formed within the piston by a devicewhich is piloted in one end ofthe cylinder and which projects into thepiston. In the best constructions also, this device is also operative asa crosshead guide and a crosshea-d works within this device, connectionbeing made between the crosshead and the piston by a piston rod passingthrough a stuffing-box formed in said device. All of the aboven'iechanisms and devices may be varied in construction within widelimits.

The invention selected to illustrate the in` vention is but one of manypossible concrete embodiments of the same and the invention therefore isnot to be restricted to the precise details ofthe structure shown anddescribed.` Furthern'iore7 certain partsof the invention are capable ofuse indpendent of other parts, and such independent use is contemplated.D

Referring to the drawings, 1 indicates the upper part of a crankcasecasting which is of' we ll known construction and is therefore merelyindicated in the present drawing.

Supported by the crankcase 1 is a block casting- 2 having a number ofcylinders 3" formed therein. The blockcasting 2 is held used inf'placevof the watervsystem, if desired.

in place upon the crankcase 1 by means of holding` bolts 4 of well knownconstruction. The upper end of the block casting 2 is fitted with acasting 5, and the casting 5 is held in place in a well known manner bymeans of bolts 6. This casting 5 forms the heads of the cylinders' 3.'-Surrounding the upper part of the cylinders 3 is a water jacket marked7 and this water acket opens through suitable apertures 8 into a waterjacket 9 formed in the casting 5 before referred to. An inlet for thewater is prou vided at 10 near the lower end of the water jacket,land anoutlet for the water is provided at 11 which is an extension of thewater jacket 9 within the casting. The casting 5 is provided withthreaded apertures 12 above each cylinder adapted nl) receive sparkplugs. Of course, air cooling means may be lVorking within each cylinder3 is a piston 13 having a pair'of elongated portsy 14 in one sidethereof. These'portsare always in register `with an intake port 15 coredin the castihgj2and opening into a vaiye chainiber 16 located beyond thewater jacketl' .foil one sideof the casting. Above the intake port 15 iscored a by-pass port 17 which v opens int-o the interior of the cylinder3 and the interior of the valve chamber 16. Upon the opposite side ofeach cylinder is located an exhaust 'port 18 cored in the casting 2 andextending through the outer wall of the water jacket 7 where it may beconnected with a suitable manifold, not shown'. By an inspectionof Fig.1, it will be seen that the port 1S is a little higher than the by-passport 1T and considerably higher than the intake port 15. v

Located immediately below the valve chamber 1G is a gas manifold 19ported at 20into the valve chamber. It will be understood that thisvalve chamber and manifold extend along or across all of the cylinders,and that the manifold 19 is ported into the valve chamber opposite eachcylinder. A pad or boss 2l.is provided in the lower wall of the manifold19 to which a carbureting device may be attached.

Above the valve chamber 16 is a clean air manifold 22 ported into thevalve chamber 16 at 23 opposite each cylinder, and provided with a pador boss 24 to which a suitable supply pipe maylbe secured.

Located within the valve chamber 16 is a rotary valve 25, this valvehaving a central aperture 26 and beingdesigned to be rotated in'tliedirection of the arrow'by mechanism not shown but well known in the art,the speed of rotation rbeing the lspeed of the crankshaft, although incertain constructions the speed may be varied when the design ot'` thevalve is also varied. The valve, 25"'is provided opposite ach cylinderwith a short circumferential recess 27 of a width equal to the widtlr ofthe intake ports 15 and by-pass ports 17. From thisl recess are extendedtwo companion recesses, each of a width corresponding with the width ofthe piston. ports 14 before referred to. rl`he ports 2O leading vrfromthe gas nianifoldl.) tothe interior of the valve chamber 1G are each ofa width equal to the width of one of the recesses 27; while the portsare of a 'width,somewhat less than the width of the valve between thecompanion recesses 2S before described. The reason for this peculiarstructure will appear hereinafter.

The piston ports 14 are always in register with the intake ports 15;while the by-pass port 17 is cut off from the interior' of the pistonwhen the piston isat the lower' end of its i'noveniient.

For the purpose of forming an induction chamber within each piston,there is provided a closed-end cylindrical device marked which isprovided with a flange 30, this -flange being counters-ank in a suitablecounter bore in the lower end of the cylinder 3. The end of the device29 projecting below 'the flange 30 is piloted in a suitable aperture inthe crankcase 1. This construction is clearly shown in Fig..1 andfurther description is deemed unnecessary land is therefore omitted inthe interest of brevity. It will be readily yunderstood that by` meansof this construction, accurate alinement of the device 29,concentrically with the cylinder sured. The device 29 is provided with asuitable stuffing-box, marked 31, of well known character. formed in thepiston 13 is a pin 33 this pin is mounted a piston rod 341. This pistonrod projects through the stallingbox 31 before referred to and isthreaded into a head 35 located below the stuliing-box.

This head 35 also carries a wristpin 36.

The lower endlof the piston rod 341 is trans- .versely grooved at 37 andthe middle section of the Wristpin 36 is transversely grooved at 38'..Engaging these grooves is a tapered bolt 39, this bolt being fittedinto the head before referred to.. Jvournaled' upon the wristpin 36 is afork The extreme cnds of the wristpin 36 are pocketed in short bossesLl2 formed on a V circular crosshead 43' which wor within the device 29before referred to.

The position ofthe closed end of the in` duction chamber that theclearance and the head of the piston-when the latter is at thelower endof its strolre-is del-initely larger than the f :learance space betweenthepiston head and the cylinder head at the' upper end of its stroke lcylinders 3 and the piston 13, is ini Secured in bosses and upon i p 4,0formed on a con' necting rod 41, the other end of which isv connectedwith a crankshaft, not shown.`

forming device 29 is such space between its head rfhe parts arl shown inFig. 1 in the position' correslmiding to zero degrees in the cycle ofopel ations of the master cylini der; and Figs. l to 10 inclusiveillustrate the position of the valve .25 with respect to the severalporti at different times during the cycle of o1 crations and indicatedin these ligurcs. la is to be understood, however, that by varying therelative positions and proportions of the ports and valve re-A cesses,different ,iming may be effected; and it is further to be understoodthat the rccesses and the valve opposite the several are `so locatedwith respect to one another as to br ng about the cycle of operations inthe seve ral cylinders in their proper order.

Referring to Alig. 1, it will be seen that at the time the pis :on atthe top of its Inovement, zero deg rees in the cycle, the gas manifold19 is in open communicationthrough the n anifold port 20, the co1npanion recesses 28, theintake `port 15, and the piston port 1L1-with theinduction chamber formel within the piston 13. At 20 degrees in tl ecycle of operations, Fig. 3, this communics tion is cut olli.I ,At thistime the piston is ',ravelin'g downward on the power stroke. After theintake is, cut olf at 20 degrees, con pression of the charge in theinduction chan ber of the piston begins. At 117 degrees, Fi g. 4t, thepiston begins to uncover Vthe exhi ust port'18 and the burned gas beginsto. blow out'throngh this port. At this time, tie by-pass port 17, theintake port 15, and as `manifold port 20, are all cut off by the 1alve.At 127 degrees, Fig. 5, the piston has begun to uncover the bypass ort17. It W ll be noted that atthis time, the recess 27 As almost inposition to open the air manifc ld port 23 to theby-pass port 17. At 135dagrees, Fig. (i, the piston has uncovered mo'e of the by-pass port 17and the recess 27 )f the valve` is in position to open commun cationbetween the air nl anifold 23 and the by-pass port 17. At this time,clean ai begins to low from the air manifold wh i 'e it is maintainedunder pressure into the combustion chamber of the cylinder'above thepiston, the pressure of the burned g: s within the cylinder havingfallen by this time below that of the clean incoming air. The result isthat the last traces of the burned gas are expelled from the cylinderand the cylinderis clean air. At 17() degrees, Fig. 7, the wall of ,thevalve between the companion recesses is coinpresseil in the inductionchalnber formed withi 1 the piston. This gas also fills the intake po t15, through the always registering piston port 14, and is held back bythe [il l ed with At this Y within Athe induction chamber is not equalto the compression of gas in., the combustion chamber 'for ignitionpurposes, but 1s sutlir cient to insure averygrapid transfer' o-the gasfrom the induction chamber to the coinbustion chamber. At 180 degrees,Fig. 8,

the recess?? of the valve Q5 opens com# munication between the intakeport 15 (and of course the induction chamber) and the combustion chamberabove the piston through the by-pass port 17. It will be readilyunderstood that as soon as the crank passes over its lower dead centerand the piston begins its upward movement, the pressure within theinduction chamber aids this movement. The power expended in thepreliminary induction chamber compression is thus in part given 'bacltto the engine. At 233 degrees, Fig, 9, the piston has moved upward farenough to cover the bypass port 17. The flow of gasiro'm the inductionchamber to the combustion chamber" therefore ceases at this time, andthe intake through the gas manifold port 20 begins to open. At 2&3degrees, Fig. 10, the piston has moved up far enough vto cover theexhaust port 1S. From this point to the end of the up stroke, the chargeof gas is being,r compressed in the combustion vchamber above the pistonand a `fresh charge is being ,drawn into `the induction chamber from the.a piston having a wallport elongated in the direction of piston traveland workinga within the cylinder, means cope ative wf the piston to forman induction chamber within said piston, and means continuouslycoperative with and coiiti'olling-the piston port to establish opencommunication between the induction chamber and the source of ,eassupply, then confine the charge of gras within the induction chambersulistantiaily to the end of the power stroke, and then eiiect itstransfer to the combustion chamber duringthe first part of the returnstroke.

2. In an internal combustion engine, the combination with a source or'gas supply, of a cylinder having a combustion chamber, a piston having awall port elongated in the direction of piston travel and Working Withinwith the piston to form an induction chamber within said piston; andmeans continuously cooperative with Aand controlling the piston port toestablish open communication between the induction chamber and thesource of gas'.

supply, then confine the charge 'of gas within the induction chambersubstantially to the end of the power stroke, and then eilect itstransfer to the combustion chamber during the irst part ot the returnstroke.

cylindrical device cooperative with the pisf' ton to form an inductionchamber within said piston. and means continuously coi'i'perative withand controlling the piston port to establish open communication betweenthe'induction chamber and the sourceof gas supply, then conliue thecharge of gas within the induction chamber substantially to the end otthe power stroke, and then e feet its transfer to the combustion chamberduringr the first part of the return stroke.

4. ln an internal combustion engine, the

combination with a source of gas supply,

oi" a cylinder having a combustion chamber,

a piston having),A a wall port elongated in the= direction of pistontravel and working within the cylinder, closed-end cylindrical devicecooperative with the piston to form -the cylinder, stationary meanscoperative icc an induction chamber within said piston,

a cross-head worling within said cylindrical device, a piston rodconnecting said crosshead with said piston, and means continuouslycooperative with and controlling the piston `port to establish opencommunicationbetween the induction chamber and the source ot gas supply,then conine the charge.

ci'inibination with a. source of gas supply,

of a cylinder having ay combustion chamber, a piston having,r a 'allport elongated in the direction of piston travel and working within thecylinder, means eoperative with the piston' to forni an inductionchamber `within said piston and having a clearance deti'nitely 'ger thanthat of the combustion chamber, and means continuously coperativewithand controlling the piston port tocstablish open communication betweenthe induction chamber and the source of gas supply, then confine thecharge of gas Within the induction chamber substantially to the end ofthe power stroke, and then effect r the direction olf piston travel derjust vpiston havi Yto establish open connnuni :ation its transfer to thecombustion chamber during the first part of the return stroke.

6. In an internal combustion engine, the combination with a source o't'gas supply, of a cylinder having a combustion chamber, a piston having aWallport elongated in the direction of piston travel and working Withinthe cylinder, means cooperative with the piston to forml an inductionchamber within said piston, means continuously cooperative with andcontrolling the piston port to establish. open communication between theinduction chamber and the source of gas supply, then confine the chargeof gas within the induction chamber substantially to the end of thepower stroke, and then effeet its transfer to the combustion chamberduring the First part of the return stroke, and means t'or 'scavengingthe eomlnistion chamber and cylinder with clean air under Lpressureijust prior tothe transfer of the fresh Vcharge of gas from theinduction chamber to the combustion chamber.

7. In an internal combustion engine, the

combination with a source ot' gas supply, of a cylinder having acombustion chamber, a piston having a wall port elongated in thedirection ot' piston travel and .working Withinthe cylinder, meanscoperatire with the piston to form an Ainduction chamber within saidpiston, means continuously cooperative with and controlling: the pistonport to establish open communication between the induction chamber andthe source of gas supply, then confine the charge of gas Within theinduction chamber substantially to the end of the power stroke, and theneiectits transfer tothe combustion chamber during the first part of thereturn stroke, and means for introducingr a charge oi clean air into`the combustion chambc' and cylinprior to the' transfer o'l a freshcharge of gas from the induction chamber to the combustion chamber.

B. In an internal combustion engine, thel combination with a source ot'gas supply, of a cylinder having a combustion chamber, a 'nga wall portelongated in the direction oi piston travel and working within thecylinder, means cooperative with the. 4piston to foi-m apn inductionchamber within said piston, and valve controlled means continuouslycooperative with the` piston port between the induction chamber and the.source of gas supply,'then confine the. charge of gas withinitheinduction chamber substantially to the end ofthe power stroke, and thenell'ect its transfer lo the combustion chamber during the lirst part olthe return stroke.

t). .Inan interni-il combustioncngine, the comllination ith a source olEgas supply, of a cylirn'lcl.' having' a combustion chamber, afpisl'onharing a wall port elongated in and working tion between the inductionchamber and tween the induction chamber and the combustion chanilierduringthe lirst part of the return stroke. V

10. In an internal combustion. engine, the combination with a source o fgas supply, of a .cylinder ha fing a combustion chamber, a piston havinga wall port elongated in the direction ot' piston tavel and workingwithin the cy inder, means cooperative with the piston tr form aninduction chamber within said listen, and a rotary valve and cooperativeivf-pass mechanism continuously cooperative n lth the piston port andadapted. to cstabls 1 open communication betweenthe induction chamberand the source of gas supply, then ,-onfine a charge of gas within-l theinductior chamber substantially to the end oi the power stroke. and thenestablish op'eu cmnnnlnication between the induction chamber and ihecombustion chamber during the first part of the return stroke.

.11. In an internal combustion engine, the combination with a source ofgas supply, of a cylinder' laringa combustion chamber, a piston havin aall port elongated .in the direction of, piston travel and workin withinthe cylinder, means cooperative wit 1 the pistonti forni an inductionchamber within said piston, a source of clean air sup-- ply, and arotary valve and coperative bypass mc .ln\nis1n continuously cooperativewith the pis Lon port and adapted to establish open communicationbetween the induction chambeand the source of gas supply, then coniinethe charge oi gas within the induction chamber substantially to the endof the power smoke, establish open communication betwlen the source ofclean air snpply and the combustion e'hamber'during the last part ot'111e power stroke, and thereafter establish op en communication betweenthe. induction ch imber and the-combustion chamber during tie first partot the return stroke.

12. In an internal combustion engine,the combination with a cylinderhaving a combustion cha ube and provided with a. bypass portant] anintake p ort in its wall, of

a piston wo 'kin'in the cylinder and having 'l a port in its wall alwaysin register withthe intake' port, means cooperative with the pistoututori i an induction chamber' Within said pistonnd means for confiningthe. hon chamber charge of grs within the indue during the last part ofthe newer stroke.

and then effecting its transfer through said ports to the combustionchamber during the first part of the return stroke.

13. In an internal combustion engine, the combination with a cylinderhaving a combustion chamber and provided with a bypass port and anintake port in its wall, of

' a piston workin in the cylinder and having a cylinder having acombustion chamber, a

Y 45 tinuouslyfcoperative with and controlling water jacket surroundingthe cylinder, a piston having a wall port elongated in tlie direction ofpiston travel and working within the cylinder, means coperative with thepiston to form an induction chamber .withiii said piston, and meanslocated mainly beyond the water Vjacket and continuousl operative withand lcontrolling the'piston port to establish open communication betweenthe induction chamber and' thev soiirce of gas supply, then confine thecharge 'of gas within the induction chamber substantially to the end ofthe power stroke, and then effeet its transfer to the combustion chamberduri-ng the first part of thereturn stroke.

15. In an internal combustion engine, the combination with a source'ofgas supply, of a plurality of cylinders each having a combustionchamber, a plurality of pistons working Within the cylinders and eachhaving a wall port elongated in the direction of piston travel, meanscoperativefwith each piston to form an induction chamber within` saidpiston,- and asingle movable member conthe piston ports: to establish inproper order openy communication between the induction chambers and thesource of gas supply, then confine in proper order charges of gaswithinthe inductionchambers substantially ,to the en d of each powerstroke, and then efect the transferin proper order of charges from theinduction chambers to the corresponding combustion chambers duringthelirstpart of*A each return stroke.

' 16. In an internal combustion engine, theA combination with a sourceof gas supply, of

a plurality of cylinders each having a Combustion chamber, a pluralityof pistons working vwithin the cylinders and each having a wall portelongated in the direction of piston travel, means coperative with eachpist'on to form an induction chamber within said piston, and a rotaryvalve common to to establish open communication in proper order betweenthe induction chambers and the source of gas supply, then confine inproper order charges of gas within the induction chambers substantiallyto the end of each power stroke, and then effect tlietransfervin properorder of charges from the induction chambers to the correspondingcombustion chambers during the lirst part of each return stroke. I

`17. In an internal combustion engine, the Combination with a source ofgas suppl-y, ot' a cylinder havinga combustion ehan'iber, a pistonhaving' a/fwallcport elongated in the direction of pisyfon travelandworking within the cylindery-,i closed-,end cylindrical devicecountcrsunl'i into one end .of the cylinder and coperative with thepiston to forni an induction" chamber within said piston, and meanscontinuously cooperative with and controlling/'the piston port toestablish open communication between vthe induction chainber and thesource otzas supply, then confine the charge of'gas within the inductionchamber substantiallyv to the end of the power stroke, und then effectits transfer to the combustion chamber during the first part ofthereturn stroke. Y

18. In an internal combustion-engine, the Combination with a source of4gas supply, of

cylinder, a closed-end cylindrical device cooperative with the piston toform an induca cylinder having a combustion chamber, a piston havingawall port elongated in the direction of'piston travel and working with-100 the cylinder, a crankcase supportingv the tion chamber within said.piston landhaving a flange between its ends 'counter-sunk into thecylinder' and clamped between the cylinder and thev crankcase andpilotedin the crankcase, and means continuously coperative with and controllingthe piston portvto establish open communication between the inductionchamber and the source of gas supply,then confine the charge of gaswithin the. induction chamber substantially to the end of the powerstroke, and then effect itsl transfer to the combustion chamber duringlthe first part of the return stroke.

ils

19. In'an internal combustion engine, the combination with a cylinderhaving a combustion chamber, of'a valve chamber having a port leadinginto the cylinder, a scavenging air conduit adjacent and having a portleading intothe valve chamber, a gas con-- duit adjacent and having aport leading into the valve chamber, a piston Working within thecylinder and having a port adapted to coperatewithA the. port leadingfrom the valve chamber, means coperative with the piston to form aninduction chamber therein, and a single 'valve working within the valvechamber and coperating with the 1anl l ingwit` several ports andarranged and adaptedto establish in proper ,order and timed relationopen communication between the combus tion chamber and! the air conduit,between the induction chamber and the gas conduit, and between the/induction and combustion chambers; o

20. In an in rnal combustion engine, the combination w ith a pluralityof cylinders each having combustion chamber, of 'a valve chambr commonto all of the cylin ders and ha ing ports leading thereinto, ascavenging ir manifold adjacent and having a port eading into the valvechamber opposite ea h cylinder, a gas manifoldadjacent and h ving a portleading into the valve chamberA working ports ad( leading rom the valvechamber, mean operativ with the pistons to form indu', n chambe/stherein, and a single valve work-` ing Wit in the valve chamber andcoperat-v the several ports and arranged and adapte '4to establish 1nAproper order, and

timed r lation open comnnlnication between .valve Cl amber extending4a'lon a series o ports. leadingintotli the conibustion chamber and theair conduit, betwee the induction chamber andthe gas condui and betweenbustion chambers. Y

21., I an internal eombustio"Y en ne combinL tion with a, plurality eachhK ving .a 'combustion the induction and`com+ and acr as all of saidcylinder scavenging air manifold and having a series of ports/.lead gvalve chamber one opposlteeach a series of ports leading-into 1 V berone opposite each cylinder, py ,v1/nis vvorlcV ing within the cylindersand lia'v/n ports adapted to coperate withnthe/prts from the valvechamberie'ansggcoje with the pistons to foifinductioncla 4 therein, anda single rotaryvalY orling within the valve', chamber andcooperatiigduit, between the induction chambers and 1` pposite each cylinder,pistons" `ithin the cylinders and having l' pted to cooperate with theports piston t timed relatior open communicatin'betiveen the combusticnchambers and the air conthe gas" condiY it, and between thel inducti andcombustion chambers. f A 22. In an i1 vternal combustion engiIie'QSthecombination Vith a cylinder havin' bust-ion chaml er, of a valve chamhaving a portvleading,l into the cylinde' "fa" duit adjacent mdhavirigav p y, the valve chainben, a pisto'nw` in the 4cylinder and having aport adapted to coperat'e v'iththe' Ai-t leading from the valve chambere( "s coperative' with the vorking Within the Q3.' Ill-an ii termal`comb Ati n engine, the

combination.v'ith ajtyinde ,l avi-ng a com bastion.chamber, Lft,valvechamber hav- 1 ileui'ngli 'the-fcylin-der in sepa- V75 iti'on ifa?gate' conduit, adjacent and @C I Y 'ndiut l Single valve iv )rkingWithin t .b er and cooperating. with?F and arranged and-adaptrhcommunication infwifi/taper' relation betwe n tlji' the gasle'onduit andcombina: 'tes' y. .Y ivheioifI have signed my lame-to thwepecificationin the presence of tiv'oenbee'rilafig witnesses.

SYDNEY4 I. 'PRESCOTT as ai. MCCANN, iramrn Looisn RUSSELL.

